| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise preventive device decreasing noise at the time of screwing work by making impact at striking hard to transmit to a tip end tool, in an impact type screwing machine rotating an anvil while striking that in a rotating direction by a hammer. SOLUTION: The noise preventive device 20 is interposed between the anvil 13 and the tip end tool B. In the noise preventive device 20, a square-wire coil spring 30 is interposed between a drive side rotor 21 and an output side rotor 22, and the square-wire coil spring 30 is wound around the rotors 21, 22 by friction to transmit rotation torque. COPYRIGHT: (C)2006,JPO&NCIPI
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